Solutions by everydaycalculation.com
1st number: 2 0/10, 2nd number: 4 0/10
2010 - 4010 is -21.
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Related: 40/10-40/10 20/10-80/10 20/10-40/20 60/10-40/10 20/30-40/10 20/10-40/30 20/50-40/10 20/10-40/50 20/70-40/10 20/10-40/70
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